{"id":71069,"date":"2020-02-23T22:07:58","date_gmt":"2020-02-23T19:07:58","guid":{"rendered":"https:\/\/prohoster.info\/blog\/chetvertushka-ethernet-a-staraya-skorost-novye-vozmozhnosti"},"modified":"2020-03-03T16:14:34","modified_gmt":"2020-03-03T13:14:34","slug":"chetvertushka-ethernet-a-staraya-skorost-novye-vozmozhnosti","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/chetvertushka-ethernet-a-staraya-skorost-novye-vozmozhnosti","title":{"rendered":"Etherneti neljandik: vana kiirus, uued v\u00f5imalused","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Etherneti neljandik: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/d10d96c9523f873599b9e858dfb50ce7.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nSel aasta 5. veebruaril kiideti heaks uus standard 10-megabitise Etherneti jaoks. Jah, te lugesite \u00f5igesti: k\u00fcmme megabitti sekundis.<\/p>\n<p>Milleks on 21. sajandil vajalik nii \"v\u00e4ike\" kiirus? Selleks, et asendada tohutu segadus, mis peidus on nimetuse \"v\u00e4liskandur\" all \u2014 Profibus, Modbus, CC-Link, CAN, FlexRay, HART jne. Need on liiga palju, nad ei ole \u00fchilduvad ja suhteliselt keerulised seadistamiseks. T\u00f5eliselt tahaks lihtsalt kaabli l\u00fclitisse pista ja k\u00f5ik. Nagu tavalise Ethernetiga.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nJa peagi see on v\u00f5imalik! Tutvuge: \"802.3cg-2019 \u2014 IEEE Standard for Ethernet \u2014 Amendment 5: Physical Layer Specifications and Management Parameters for 10 Mb\/s Operation and Associated Power Delivery over a Single Balanced Pair of Conductors.\" <\/p>\n<p>Miks on see uus Ethernet huvitav? Esiteks \u2014 ta t\u00f6\u00f6tab \u00fche p\u00f6\u00f6ratud paari kaudu, mitte nelja kaudu. Seet\u00f5ttu on tal v\u00e4hem liideseid ja \u00f5hemad kaablid. Ja saab kasutada juba paigaldatud p\u00f6\u00f6rdpaari, mis viib anduriteni ja teostamisv\u00f5imeteni.<\/p>\n<p>V v\u00f5ite vaielda, et Ethernet t\u00f6\u00f6tab kuni 100 meetrit, kuid andurid asuvad palju kaugemal. T\u00f5epoolest, see oli varem probleem. Kuid 802.3cg t\u00f6\u00f6tab kuni 1 km kaugusel! \u00dche paari kaudu! Pole paha? <\/p>\n<p>Tegelikult on veelgi parem: selle sama paari kaudu saab edastada ka toite. Alustame sellega.<\/p>\n<h3>IEEE 802.3bu andmestruktuuride toite edastamine (PoDL)<\/h3>\n<p>\nMa arvan, et paljud teist on kuulnud PoE-st (Power over Ethernet) ning teavad, et toite edastamiseks on vajalikud kaks juhtme paari. Toite sisend\/v\u00e4ljund on iga paari transformeerijate keskmistes punktides. \u00dche paari abil seda teha ei \u00f5nnestu. Seet\u00f5ttu tuli leida teine lahendus. Kuidas t\u00e4pselt \u2013 on n\u00e4idatud alloleval joonisel. N\u00e4iteks on lisatud ka klassikaline PoE.<\/p>\n<p><img decoding=\"async\" alt=\"Etherneti neljandik: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/bb89378da53efb0a9bbf0a9edf583155.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSiin:<br \/>\nPSE \u2013 toiteallika seadmed<br \/>\nPD \u2013 toidetav seade (seade kaugemas otsas, mis tarbib elektrit)<\/p>\n<p>Alguses oli 802.3bu-l 10 toiteklass:<\/p>\n<p><img decoding=\"async\" alt=\"Etherneti neljandik: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/5d089748498a37f5ae75cc0b8629dc42.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAllpool on m\u00e4rgitud kolm tingimuslikku pingeklassi: 12, 24 ja 48V.<\/p>\n<p>M\u00e4rgistused:<br \/>\nVpse \u2014 toitepinged, V<br \/>\nVpd min \u2014 minimaalne pinged PD-l, V<br \/>\nI max \u2014 maksimaalne vool joonel, A<br \/>\nPpd max \u2014 maksimaalne PD poolt tarbitav v\u00f5imsus, W<\/p>\n<p>Protokolliga 802.3cg lisandus veel 6 klassi:<\/p>\n<p><img decoding=\"async\" alt=\"Etherneti neljandik: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/cb2677254d132ad27c4daf06489795ea.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMuidugi, sellise mitmekesisuse t\u00f5ttu peavad PSE ja PD enne t\u00e4ieliku pingega toite andmist n\u00f5uetekohaselt\u00e9die klassi kokku leppima. Seda teostatakse SCCP (Serial Communications Classification Protocol) abil. See on madala kiirusel t\u00f6\u00f6tav protokoll (333 bitti\/s), mis p\u00f5hineb 1-Wire s\u00fcsteemil. See toimib ainult siis, kui toitejuhtmes ei toimi p\u00f5hivool (sh unere\u017eiimis).<\/p>\n<p>Toite andmise protsess on joonisel kujutatud:<\/p>\n<ul>\n<li>antoit muudetakse 10mA ja kontrollitakse stabilizatori olemasolu 4V juures<\/li>\n<li>toiteklasside koosk\u00f5lastamine toimub<\/li>\n<li>p\u00f5hivoolu jagamine<\/li>\n<li>kui tarbimine langeb alla 10mA \u2013 l\u00fclitub sisse unere\u017eiim (3.3V standby toite andmine)<\/li>\n<li>kui tarbimine \u00fcletab 1mA \u2013 toimub unere\u017eiimist v\u00e4ljumine<\/li>\n<\/ul>\n<p>\n<img decoding=\"async\" alt=\"Etherneti neljandik: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/ac282970ea69804211da01c9c6a384b8.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nToite klasside koosk\u00f5lastamist ei ole vaja teostada, kui see on eelnevalt teada. Sellist varianti nimetatakse kiir k\u00e4ivitamise re\u017eiimiks. Seda kasutatakse n\u00e4iteks autodes, kuna seal ei ole vaja muuta \u00fchendatud seadmete konfiguratsiooni.<\/p>\n<p>Unere\u017eiimi sisenemise algatamine on v\u00f5imalik nii PSE kui ka PD poolt.<\/p>\n<p>Liigume edasi andmeedastuse kirjeldusse. Seal on samuti huvitav: standardis on m\u00e4\u00e4ratletud kaks t\u00f6\u00f6re\u017eiimi \u2013 pika vahemaa ja l\u00fchikeste vaheaegade jaoks. <\/p>\n<h3>10BASE-T1L<\/h3>\n<p>\nSee on variant pika vahemaa (long reach) jaoks. Peamised omadused on j\u00e4rgmised:<\/p>\n<ul>\n<li>t\u00f6\u00f6s kaugus \u2013 kuni 1 km<\/li>\n<li>juhtmed 18AWG (0,8 mm\u00b2)<\/li>\n<li>kuni 10 vahepealset \u00fchendust (ja kaks l\u00f5ppu)<\/li>\n<li>punkt-punkt t\u00f6\u00f6re\u017eiim<\/li>\n<li>t\u00e4isd\u00fcpleks<\/li>\n<li>s\u00fcmboli kiirus 7,5 Mbaud<\/li>\n<li>moodulatsioon PAM-3, kodeerimine 4B3T<\/li>\n<li>signaal amplituudiga 1V (1Vpp) v\u00f5i 2,4V<\/li>\n<li>toetab Energy Efficient Ethernet (\u201cquiet\/refresh\u201d EEE)<\/li>\n<\/ul>\n<p>\nOn ilmne, et see variant on m\u00f5eldud t\u00f6\u00f6stuslikuks kasutamiseks, juurdep\u00e4\u00e4sukontrolli s\u00fcsteemide, hoonete automatiseerimise, liftide jaoks. Katusel asuvate chillide, kliimaseadmete, ventilaatoreid juhtimiseks. V\u00f5i tehnilistes ruumides asuvate soojuspumpade ja katelde jaoks. See t\u00e4hendab rohkelt erinevaid rakendusi, mis ei ole seotud pelgalt t\u00f6\u00f6stusega. R\u00e4\u00e4kimata asjade internetist (IoT).<\/p>\n<p>Oluline on m\u00e4rkida, et 10BASE-T1 on vaid \u00fcks Single Pair Ethernet (SPE) standarditest. On olemas ka 100BASE-T1 (802.3bw) ja 1000BASE-T1 (802.3bp). T\u00f5si, need on v\u00e4lja t\u00f6\u00f6tatud autot\u00f6\u00f6stuse rakenduste jaoks, mist\u00f5ttu nende vahemaa j\u00e4\u00e4b 15 (UTP) v\u00f5i 40 meetrini (STP). Siiski on plaanides ka kaugs\u00f5iduks ette n\u00e4htud 100BASE-T1L. Nii et tulevikus lisatakse automaatne kiirusreguleerimine. <\/p>\n<p>Aga praegu ei kasutata kiirusreguleerimist \u2013 on lubatud \u201ekiire algus\u201c liidese jaoks: alla 100 ms toite sissel\u00fclitamisest andmevahetuse alguseni.<\/p>\n<p>Teine v\u00f5imalus (valikuline) on suurendada edastuse amplituudi 1-lt 2,4 V-le, et parandada signaali \/ m\u00fcra suhet, v\u00e4hendada vigade arvu ning tuvastada t\u00f6\u00f6stuslikke h\u00e4ireid.<\/p>\n<p>Ja muidugi, EEE. See on elektri s\u00e4\u00e4stmise meetod, l\u00fclitades v\u00e4lja saatja, kui andmeid pole edastamiseks. Diagrammil on n\u00e4idatud, kuidas see v\u00e4lja n\u00e4eb:<br \/>\n<img decoding=\"async\" alt=\"Etherneti neljandik: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/888029d8582e22cb5c5bb39d5f485aa9.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAndmeid pole \u2013 saadame teate \u201ema l\u00e4ksin magama\u201c ja l\u00fclitume v\u00e4lja. Aeg-ajalt \u00e4rkame ja saadame teate \u201ema olen veel siin\u201c. Kui andmed ilmuvad, antakse teisele poolele hoiatuseks \u201ema \u00e4rkan \u00fcles\u201c ja edastus algab. See t\u00e4hendab, et pidevalt t\u00f6\u00f6tavad ainult vastuv\u00f5tjad.<\/p>\n<p>Vaatame n\u00fc\u00fcd, mida on v\u00e4lja m\u00f5eldud teise standardi variandi kohta.<\/p>\n<h3>10BASE-T1S<\/h3>\n<p>\nViimase t\u00e4he j\u00e4rgi on juba selge, et see on l\u00fchikese vahemaa (short reach) protokoll. Aga miks see vajalik on, kui l\u00fchikeste vahemaade jaoks t\u00f6\u00f6tab ka T1L? Loe omadusi:<\/p>\n<ul>\n<li>toimimisulatus kuni 15m punkti-punkti re\u017eiimis<\/li>\n<li>t\u00e4isdupleks v\u00f5i pooldupleks<\/li>\n<li>juhtmed 24-26AWG (0.2-0.13mm\u00b2)<\/li>\n<li>s\u00fcmboli kiirus 12.5Mb\/s<\/li>\n<li>DME, kodeerimine 4B5B<\/li>\n<li>signaal amplituudiga 1V (1Vpp)<\/li>\n<li>kuni 4 vahe\u00fchendust (ja kaks l\u00f5pp\u00fchendust)<\/li>\n<li>EEE toetust pole<\/li>\n<\/ul>\n<p>\nTundub, et pole midagi erilist. Aga milleks see siis vajalik on? Siin on p\u00f5hjused:<\/p>\n<ul>\n<li>toimimisulatus kuni 25m mitme punktiga re\u017eiimis (kuni 8 s\u00f5lme)<\/li>\n<\/ul>\n<p>\nJa selleks:<\/p>\n<ul>\n<li>t\u00f6\u00f6mood PLCA RS (PHY-Level Collision Avoidance Reconciliation Sublayer) konfliktide v\u00e4ltimisega<\/li>\n<\/ul>\n<p>\nSee on juba palju huvitavam, eks? Kuna see aitab oluliselt v\u00e4hendada juhtmete arvu juhtimiskappid, masinates, robotites, autodes. Ja juba on tehtud ettepanek seda kasutada I2C asendajana <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/et\/server\/dts-gdansk\/\"   title=\"serverites\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4502\">serverites<\/a>, l\u00fclitites ja muudes elektroonikaseadmetes.<\/p>\n<p><img decoding=\"async\" alt=\"Etherneti neljandik: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/98614d57cc671efc36bee4d3251f8e60.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKuid multipoint-re\u017eiimil on oma puudused. Peamine neist on jagatud andmeedastus keskkond. Loomulikult lahendatakse kokkup\u00f5rked CSMA\/CD abil. Kuid pole teada, milline on viivitus. Ja m\u00f5nede rakenduste jaoks on see kriitiline. Seet\u00f5ttu on uus standard lisanud multipointi jaoks spetsiaalse PLCA RS re\u017eiimi (vt j\u00e4rgmist jaotist).<\/p>\n<p>Teine puudus on see, et multipoint-re\u017eiimis ei t\u00f6\u00f6ta PoDL. See t\u00e4hendab, et toide tuleb anda eraldi kaabli kaudu v\u00f5i leida kohapealt. <\/p>\n<p>Kuid punkt-punkt re\u017eiimis t\u00f6\u00f6tab PoDL ka T1S-l.<\/p>\n<h3>PLCA RS<\/h3>\n<p>\nSee re\u017eiim t\u00f6\u00f6tab j\u00e4rgmiselt:<\/p>\n<ul>\n<li>s\u00f5lmed jagavad omavahel identifikaatoreid, s\u00f5lm ID=0 muutub koordineerijaks<\/li>\n<li>koordineerija saadab v\u00f5rku BEACON signaali, mis t\u00e4histab uue edastusts\u00fckli algust ja edastab oma andmepaketi<\/li>\n<li>p\u00e4rast andmepaketi edastamist liikub edastusj\u00e4rjekord j\u00e4rgmisele s\u00f5lmele<\/li>\n<li>kui 20 bitti edastamiseks vajalikus ajas ei alustanud s\u00f5lm edastamist, liigub j\u00e4rjekord j\u00e4rgmisele s\u00f5lmele<\/li>\n<li>kui k\u00f5ik s\u00f5lmed on andmed edastanud (v\u00f5i j\u00e4tnud oma j\u00e4rjekorra vahele), alustab koordineerija uut ts\u00fcklit<\/li>\n<\/ul>\n<p>\n\u00dcldiselt sarnaneb see TDMA-le. Kuid omadusega, et s\u00f5lme ei kasuta oma ajaraami, kui tal pole midagi edastada. Ja raami suurus ei ole rangelt m\u00e4\u00e4ratud, kuna see s\u00f5ltub s\u00f5lme edastatavast andmepaketi suurusest. K\u00f5ik see t\u00f6\u00f6tab standardsete Ethernet 802.3 raamide peal (PLCA RS ei ole kohustuslik, seega peab toimuma \u00fchilduvus).<\/p>\n<p>PLCA kasutamise tulemused on allpool graafikutes. Esimene \u2013 viivitus s\u00f5ltuvalt koormusest, teine \u2013 ribalaius s\u00f5ltuvalt edastavate s\u00f5lmede arvust. On selgelt n\u00e4ha, et viivitus on muutunud palju ennustatumaks. Ja halvemal juhul on see kaks korda v\u00e4iksem kui halvemal juhul CSMA\/CD puhul:<\/p>\n<p><img decoding=\"async\" alt=\"Etherneti neljandik: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/62bd8e271e7d882095281b37f63d8426.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nJa kanali ribalaius on PLCA korral k\u00f5rgem, kuna seda ei kulutata kollisioonide lahendamisele:<\/p>\n<p><img decoding=\"async\" alt=\"Etherneti neljandik: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/b66a9bb8836a6d8d9aa0b21d1136f186.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>Pistikud<\/h3>\n<p>\nEsialgu valiti kuue erineva tootja pakutud pistiku variandi hulgast. L\u00f5ppkokkuv\u00f5ttes peatusime nende kahe variandi peal: <\/p>\n<p><img decoding=\"async\" alt=\"Etherneti neljandik: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/0edb52b01e5d082069a10d46a57cd540.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTavatingimuste jaoks valiti CommScope'i LC pistik IEC 63171-1. <\/p>\n<p><img decoding=\"async\" alt=\"Etherneti neljandik: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/a4b8c60e1ffbb0008973a0c5fe1d8dca.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nRaskete t\u00f6\u00f6tingimuste jaoks valiti HARTINGi IEC 63171-6 (endine 61076-3-125) pistikute perede kogum. Need pistikud on kaitstud IP20 kuni IP67 klasside vastu.<\/p>\n<p><img decoding=\"async\" alt=\"Etherneti neljandik: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/88150dd0f844444ab76d6c3f394658f0.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMuidugi v\u00f5ivad pistikud ja kaablid olla nii UTP kui ka STP. <\/p>\n<h3>Muud<\/h3>\n<p>\nTavalist neljapaari Etherneti kaablit saab kasutada, kasutades iga paari eraldi SPE kanali jaoks. Et mitte vedada nelja eraldi kaablit kuhugi kaugele. V\u00f5i kasutada \u00fchte paarikaablit, mille l\u00f5pus on \u00fchemassis Etherneti l\u00fcliti. <\/p>\n<p>Seda l\u00fclitit saab otse ettev\u00f5tte kohaliku v\u00f5rku \u00fchendada, kui seal on juba kaugele viidud kiudoptiline v\u00f5rgu\u00fchendus. \u00dchendada sinna andurid ja j\u00e4lgida nende n\u00e4itudeid siin samas. Otse v\u00f5rgu kaudu. Ilma liidese muundurite ja v\u00e4ravate vajaduseta. <\/p>\n<p>Ja need ei pea tingimata olema andurid. Need v\u00f5ivad olla ka kaamerad, fonolukud v\u00f5i \"targad\" lambid. M\u00f5ne ventiili mootori v\u00f5i turvav\u00e4ravate mehhanismid.<\/p>\n<p>Nii et huvitavad perspektiivid avanevad. T\u00f5en\u00e4oliselt SPE ei asenda k\u00f5iki v\u00e4li-busse. Kuid see v\u00f5tab kindlasti neist m\u00e4rkimisv\u00e4\u00e4rse osa. Eriti autodes.<\/p>\n<p><i>PS Ma ei leidnud standardi teksti avalikus juurdep\u00e4\u00e4sus. \u00dclaltoodud teave on kogutud erinevatest esitlustest ja internetis kergesti k\u00e4ttesaadavatest materjalidest. Seega v\u00f5ivad selles olla ebat\u00e4psused.<\/i><br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/489314\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>5 \u0444\u0435\u0432\u0440\u0430\u043b\u044f \u044d\u0442\u043e\u0433\u043e \u0433\u043e\u0434\u0430 \u0431\u044b\u043b \u0443\u0442\u0432\u0435\u0440\u0436\u0434\u0451\u043d \u043d\u043e\u0432\u044b\u0439 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442 \u043d\u0430 10-\u043c\u0435\u0433\u0430\u0431\u0438\u0442\u043d\u044b\u0439 Ethernet. \u0414\u0430, \u0432\u044b \u0432\u0435\u0440\u043d\u043e \u043f\u0440\u043e\u0447\u0438\u0442\u0430\u043b\u0438: \u0434\u0435\u0441\u044f\u0442\u044c \u043c\u0435\u0433\u0430\u0431\u0438\u0442 \u0432 \u0441\u0435\u043a\u0443\u043d\u0434\u0443. \u0414\u043b\u044f \u0447\u0435\u0433\u043e \u0432 21-\u043c \u0432\u0435\u043a\u0435 \u043d\u0443\u0436\u043d\u0430 \u0442\u0430\u043a\u0430\u044f \u00ab\u043c\u0430\u043b\u0435\u043d\u044c\u043a\u0430\u044f\u00bb \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u044c? 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